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                <h1 id="📄-日志"><a href="#📄-日志" class="headerlink" title="📄 日志"></a>📄 日志</h1><hr>
<h2 id="1-日志框架"><a href="#1-日志框架" class="headerlink" title="1. 日志框架"></a>1. 日志框架</h2><p>写了一个统一的接口层，日志门面（日志的一个抽象层）</p>
<p>给项目中导入具体的日志实现就行了；我们的日志框架都是实现的抽象层；</p>
<p><strong>市面上的日志框架；</strong></p>
<p>JUL、JCL、Jboss-logging、logback、log4j、log4j2、slf4j….</p>
<table>
<thead>
<tr>
<th>日志门面  （日志的抽象层）</th>
<th>日志实现</th>
</tr>
</thead>
<tbody><tr>
<td><del>JCL（Jakarta  Commons Logging）</del>    SLF4j（Simple  Logging Facade for Java）    <strong><del>jboss-logging</del></strong></td>
<td>Log4j  JUL（java.util.logging）  Log4j2  <strong>Logback</strong></td>
</tr>
</tbody></table>
<p>👉 左边选一个门面（抽象层）、右边来选一个实现；</p>
<p>日志门面：  SLF4J</p>
<p>日志实现：Logback</p>
<p>SpringBoot：底层是 Spring 框架，Spring 框架默认是用 JCL</p>
<p>🚩 <strong>SpringBoot 选用 SLF4j 和 logback</strong></p>
<h2 id="2-SLF4j-使用"><a href="#2-SLF4j-使用" class="headerlink" title="2. SLF4j 使用"></a>2. SLF4j 使用</h2><h3 id="①-如何在系统中使用-SLF4j"><a href="#①-如何在系统中使用-SLF4j" class="headerlink" title="① 如何在系统中使用 SLF4j"></a>① 如何在系统中使用 SLF4j</h3><p>以后开发的时候，日志记录方法的调用，不应该来直接调用日志的实现类，而是<strong>调用日志抽象层里面的方法</strong>；</p>
<p>给系统里面导入slf4j 的 jar 包和  logback 的实现 jar 包</p>
<blockquote>
<p><a target="_blank" rel="noopener" href="https://www.slf4j.org/">https://www.slf4j.org</a></p>
</blockquote>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>slf4j<span class="token punctuation">.</span></span><span class="token class-name">Logger</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>slf4j<span class="token punctuation">.</span></span><span class="token class-name">LoggerFactory</span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">HelloWorld</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token class-name">Logger</span> logger <span class="token operator">=</span> <span class="token class-name">LoggerFactory</span><span class="token punctuation">.</span><span class="token function">getLogger</span><span class="token punctuation">(</span><span class="token class-name">HelloWorld</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    logger<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">"Hello World"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>图示：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200530101749.png"></p>
<p>每一个日志的实现框架都有自己的配置文件。使用 slf4j 以后，<strong>配置文件还是做成日志实现框架自己本身的配置文件</strong></p>
<h3 id="②-遗留问题"><a href="#②-遗留问题" class="headerlink" title="② 遗留问题"></a>② 遗留问题</h3><p>💬 比如：a 系统使用的日志框架（slf4j+logback）:  Spring（commons-logging）、Hibernate（jboss-logging）、MyBatis、xxxx</p>
<p>❓ <strong>如何统一日志记录呢？即使是别的框架也统一使用 slf4j 进行输出</strong></p>
<ul>
<li><p>将系统中其他日志框架先排除出去</p>
</li>
<li><p>用中间包来替换原有的日志框架</p>
</li>
<li><p>导入 slf4j 其他的实现</p>
</li>
</ul>
<p>⭐ <strong>slf4j 的日志适配图</strong>如下：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200530102415.png"></p>
<h2 id="3-SpringBoot日志关系"><a href="#3-SpringBoot日志关系" class="headerlink" title="3. SpringBoot日志关系"></a>3. SpringBoot日志关系</h2><p>SpringBoot使用它来做日志功能；</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
		<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
		<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-logging<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<p>底层依赖关系</p>
<blockquote>
<p>分析依赖关系，如何在 IDEA 中打开下图所示的依赖关系图：</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200530103743.png" style="zoom:80%;" />
</blockquote>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200530103809.png"></p>
<p>总结：</p>
<ul>
<li><p>SpringBoot 底层使用 slf4j+logback 的方式进行日志记录</p>
</li>
<li><p>SpringBoot 把其他的日志都替换成了 slf4j</p>
</li>
<li><p>中间替换包：底层源码举例如下</p>
  <pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@SuppressWarnings</span><span class="token punctuation">(</span><span class="token string">"rawtypes"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token keyword">abstract</span> <span class="token keyword">class</span> <span class="token class-name">LogFactory</span> <span class="token punctuation">&#123;</span>

    <span class="token keyword">static</span> <span class="token class-name">String</span> UNSUPPORTED_OPERATION_IN_JCL_OVER_SLF4J <span class="token operator">=</span> <span class="token string">"http://www.slf4j.org/codes.html#unsupported_operation_in_jcl_over_slf4j"</span><span class="token punctuation">;</span>

    <span class="token keyword">static</span> <span class="token class-name">LogFactory</span> logFactory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SLF4JLogFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>  <img src="https://gitee.com/veal98/images/raw/master/img/20200530104011.png"></p>
</li>
</ul>
<p>⭐ <strong>如果我们要引入其他框架，一定要把这个框架的默认日志依赖移除掉</strong></p>
<p>比如 Spring Boot 会排除掉 Spring 框架使用的 commons-logging框架：</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-core<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>exclusions</span><span class="token punctuation">></span></span>
		<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>exclusion</span><span class="token punctuation">></span></span>
			<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>commons-logging<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
			<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>commons-logging<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
		<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>exclusion</span><span class="token punctuation">></span></span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>exclusions</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><strong>SpringBoot能自动适配所有的日志，而且底层使用 slf4j+logback 的方式记录日志，引入其他框架的时候，只需要把这个框架依赖的日志框架排除掉即可</strong></p>
<h2 id="4-日志使用"><a href="#4-日志使用" class="headerlink" title="4. 日志使用"></a>4. 日志使用</h2><h3 id="①-默认配置"><a href="#①-默认配置" class="headerlink" title="① 默认配置"></a>① 默认配置</h3><p>SpringBoot默认帮我们配置好了日志：</p>
<p>日志的级别：由低到高</p>
<p>trace &lt; debug &lt; info &lt; warn &lt; error</p>
<p>可以调整输出的日志级别，日志就只会在这个级别以以后的高级别生效。在全局配置文件中进行调整，比如：</p>
<pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token attr-name">logging.level.com.smallbeef</span> <span class="token punctuation">=</span> <span class="token attr-value">trace</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>SpringBoot默认给我们使用的是 info 级别的，没有指定级别的就用SpringBoot默认规定的级别</p>
<p>💬 示例代码如下：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@SpringBootTest</span>
<span class="token keyword">class</span> <span class="token class-name">DemoApplicationTests</span> <span class="token punctuation">&#123;</span>

    <span class="token comment">//记录器</span>
    <span class="token class-name">Logger</span> logger <span class="token operator">=</span> <span class="token class-name">LoggerFactory</span><span class="token punctuation">.</span><span class="token function">getLogger</span><span class="token punctuation">(</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">contextLoads</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//System.out.println();</span>
        logger<span class="token punctuation">.</span><span class="token function">trace</span><span class="token punctuation">(</span><span class="token string">"这是trace日志..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        logger<span class="token punctuation">.</span><span class="token function">debug</span><span class="token punctuation">(</span><span class="token string">"这是debug日志..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//SpringBoot默认给我们使用的是info级别的，没有指定级别的就用SpringBoot默认规定的级别；root级别</span>
        logger<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">"这是info日志..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        logger<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"这是warn日志..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        logger<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"这是error日志..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>输出结果如下：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200530110404.png"></p>
<p>⚙ <strong>SpringBoot 修改日志的默认配置：</strong></p>
<ul>
<li><p><code>loggin.path = springboot.log</code>：指定生成日志文件的位置（可以指定完整的路径，不指定路径在当前项目下生成日志）</p>
</li>
<li><p><code>logging.file = /spring/log</code>：和 path 是冲突设置，同样用于指定生成日志文件的位置，在当前磁盘的根路径下创建spring 文件夹和 log 子文件夹；使用 spring.log 作为默认文件</p>
<table>
<thead>
<tr>
<th>logging.file</th>
<th>logging.path</th>
<th>Example</th>
<th>Description</th>
</tr>
</thead>
<tbody><tr>
<td>(none)</td>
<td>(none)</td>
<td></td>
<td>只在控制台输出</td>
</tr>
<tr>
<td>指定文件名</td>
<td>(none)</td>
<td>my.log</td>
<td>输出日志到my.log文件</td>
</tr>
<tr>
<td>(none)</td>
<td>指定目录</td>
<td>/var/log</td>
<td>输出到指定目录的 spring.log 文件中</td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody></table>
</li>
<li><p><code>logging.pattern.console = %d&#123;yyyy-MM-dd&#125; [%thread] %-5level %logger&#123;50&#125; - %msg%n</code>：在控制台输出的日志的格式</p>
<p>  日志输出格式：</p>
<ul>
<li>%d 表示日期时间</li>
<li>%thread 表示线程 ID，</li>
<li>%-5level：日志级别，左对齐显示5个字符宽度</li>
<li>%logger{50} 表示 logger 名字最长50个字符，否则按照句点分割。 </li>
<li>%msg：日志消息，</li>
<li>%n是换行符</li>
</ul>
</li>
<li><p><code>logging.pattern.file = %d&#123;yyyy-MM-dd&#125; === [%thread] === %-5level === %logger&#123;50&#125; ==== %msg%n</code>：指定文件中日志输出的格式</p>
  <pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token attr-name">logging.level.com.smallbeef</span> <span class="token punctuation">=</span> <span class="token attr-value">trace</span>

<span class="token comment"># 不指定路径在当前项目下生成springboot.log日志</span>
<span class="token comment"># 可以指定完整的路径；</span>
<span class="token comment">#logging.file=G:/springboot.log</span>

<span class="token comment"># 在当前磁盘的根路径下创建spring文件夹和里面的log文件夹；使用 spring.log 作为默认文件</span>
<span class="token attr-name">logging.path</span><span class="token punctuation">=</span><span class="token attr-value">/spring/log</span>

<span class="token comment">#  在控制台输出的日志的格式</span>
<span class="token attr-name">logging.pattern.console</span><span class="token punctuation">=</span><span class="token attr-value">%d&#123;yyyy-MM-dd&#125; [%thread] %-5level %logger&#123;50&#125; - %msg%n</span>
<span class="token comment"># 指定文件中日志输出的格式</span>
<span class="token attr-name">logging.pattern.file</span><span class="token punctuation">=</span><span class="token attr-value">%d&#123;yyyy-MM-dd&#125; === [%thread] === %-5level === %logger&#123;50&#125; ==== %msg%n</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
</ul>
<h3 id="②-指定配置"><a href="#②-指定配置" class="headerlink" title="② 指定配置"></a>② 指定配置</h3><p>在 resources 文件夹下添加每个日志框架自己的配置文件即可，SpringBoot 就不会使用默认的配置了</p>
<table>
<thead>
<tr>
<th>Logging System</th>
<th>Customization</th>
</tr>
</thead>
<tbody><tr>
<td>Logback</td>
<td><code>logback-spring.xml</code>, <code>logback-spring.groovy</code>, <code>logback.xml</code> or <code>logback.groovy</code></td>
</tr>
<tr>
<td>Log4j2</td>
<td><code>log4j2-spring.xml</code> or <code>log4j2.xml</code></td>
</tr>
<tr>
<td>JDK (Java Util Logging)</td>
<td><code>logging.properties</code></td>
</tr>
</tbody></table>
<p>✨ 细节：</p>
<ul>
<li><p>如果日志配置文件名为 logback.xml：直接就被日志框架识别了，跳过 Spring Boot</p>
</li>
<li><p>如果日志配置文件名为 <strong>logback-spring.xml</strong>：日志框架就不直接加载日志的配置项，由Spring Boot解析日志配置，<strong>可以使用 Spring Boot 的高级 Profile 功能，可以指定某段配置只在某个环境下生效</strong></p>
<p>  💬 示例代码如下：</p>
  <pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>appender</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>stdout<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ch.qos.logback.core.ConsoleAppender<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>layout</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ch.qos.logback.classic.PatternLayout<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>springProfile</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>dev<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>pattern</span><span class="token punctuation">></span></span>%d&#123;yyyy-MM-dd HH:mm:ss.SSS&#125; ----> [%thread] ---> %-5level %logger&#123;50&#125; - %msg%n<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>pattern</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>springProfile</span><span class="token punctuation">></span></span>
            
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>springProfile</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>!dev<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>pattern</span><span class="token punctuation">></span></span>%d&#123;yyyy-MM-dd HH:mm:ss.SSS&#125; ==== [%thread] ==== %-5level %logger&#123;50&#125; - %msg%n<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>pattern</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>springProfile</span><span class="token punctuation">></span></span>
            
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>layout</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>appender</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>  在全局配置文件中激活环境</p>
  <pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token attr-name">spring.profiles.aactive</span> <span class="token punctuation">=</span> <span class="token attr-value">dev</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<blockquote>
<p>如果使用 logback.xml 作为日志配置文件，还要使用 profile 功能，会有以下错误</p>
<p><code>no applicable action for [springProfile]</code></p>
</blockquote>
</li>
</ul>
<h2 id="5-切换日志框架"><a href="#5-切换日志框架" class="headerlink" title="5. 切换日志框架"></a>5. 切换日志框架</h2><p>可以按照 slf4j 的日志适配图，进行相关的切换</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200530102415.png"></p>
<p>比如：slf4j + log4j 的方式：</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-web<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>exclusions</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>exclusion</span><span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>logback-classic<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>ch.qos.logback<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>exclusion</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>exclusion</span><span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>log4j-over-slf4j<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.slf4j<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>exclusion</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>exclusions</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.slf4j<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>slf4j-log4j12<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<p>切换为log4j2</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-web<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>  
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>exclusions</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>exclusion</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-logging<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>exclusion</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>exclusions</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-log4j2<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="📚-References"><a href="#📚-References" class="headerlink" title="📚 References"></a>📚 References</h2><ul>
<li><a target="_blank" rel="noopener" href="https://www.bilibili.com/video/BV1Et411Y7tQ">视频 - SpringBoot_权威教程_雷丰阳_尚硅谷</a></li>
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